Inductor devices – Winding with terminals – taps – or coil conductor end...
Reexamination Certificate
1999-09-30
2001-07-17
Gellner, Michael L. (Department: 2832)
Inductor devices
Winding with terminals, taps, or coil conductor end...
C336S229000, C336S198000, C336S090000
Reexamination Certificate
active
06262651
ABSTRACT:
BACKGROUND OF THE INVENTION
This invention relates to a coil device utilized for various types of electronic apparatuses such as a display unit, power supply equipment and the like.
FIG. 3
is an illustration showing an example of known process steps for assembling a known toroidal type coil device. The coil device generally denoted by reference numeral
20
comprises a coil body with a wiring coil wound therearound, which coil body is composed of a synthetic resin core cover
30
with a core
22
received therein, and a synthetic resin base
24
which is provided with terminals
25
and on which the coil body is to be mounted.
The coil device
20
is assembled in the following sequential steps, for example.
First, toroidal magentic core
22
is received between case halves
21
,
21
and integrally assembled into a unitary structure with the core cover
30
. The core cover
30
thus obtained is then placed on the base
24
and a claw-like portion
23
formed on its bottom portion is brought into engagement with an edge portion of an engagement hole
26
formed in a central portion of the base
24
. At that time, in order to eliminate attachment chattering (looseness of joints) of the core cover
30
, the core cover
30
and the base
24
are attached together by adhesive agent or the like after the claw-like portion
23
is engaged with the engagement hole
26
. After the core cover
30
and the base
24
are firmly attached together, a terminal portion of the wiring coil is soldered to a pin terminal
25
projecting from the base
24
. By doing so, the procedure for assembling the coil device
20
is completed. The winding operation of the wiring coil
27
is performed after the core cover
30
is assembled or after the core cover
30
is firmly attached to the base
24
.
However, the engagement mechanism between the core cover
30
and the base
24
has such a shortcoming that the engagement portion (namely, the claw structure) is inevitably reduced in size compared with the core cover
30
in view of structure, with the result that the assembled coil device
20
is inferior in vibration resistance and shock resistance. For this reason, it is difficult to apply the above engagement mechanism to a larger-sized core without sacrificing reliability. If adhesive agent or the like is used in order to enhance vibration resistance and shock resistance, the assembling process steps and material expenses are increased, thus resulting in higher manufacturing cost.
SUMMARY OF THE INVENTION
It is, therefore, an object of the present invention to provide a coil device by which it is possible to obviate the shortcoming inherent in the prior art device, and which provides an economical efficiency and excellent vibration resistance and shock resistance.
In order to achieve the above object, there is essentially provided a coil device comprising:
a coil body having a magnetic core, a wiring coil wound around said magnetic core, and an insulative core cover for receiving therein said magnetic core, and
an insulative base, having terminals, for mounting thereon said coil body,
wherein said core cover has a planar support portion adaptable to said insulative base,
one of said support portion and said insulative base having, at areas in the vicinity of opposite end portions thereof, engagement grooves, and
the other of said support portion and said insulative base having, at areas in the vicinity of opposite ends thereof, ridges engageable with said engagement grooves, so that said support portion may be brought into engagement with said insulative base through an engagement mechanism composed of said engagement grooves and said ridges.
By virtue of the above construction, the core cover can firmly be attached to the base because the former is engaged with the latter at two spots (i.e., opposite ends) of the support portion due to the engagement structure between the engagement groove and the ridge. Thus, the coil device is enhanced in vibration resistance and shock resistance. This makes it possible to apply the present invention to a larger-sized core without sacrificing reliability.
The engagement mechanism is preferably provided with a stopper.
By virtue of a provision of a stopper, the core cover, when being attached, can easily and reliably be positioned. Thus, the coil device can more easily be assembled.
It is preferred that either the support portion or the base is provided with a claw-like portion and the other is provided with an interlocking protrusion which can be interlocked to the claw-like portion.
By virtue of the above construction, the core cover, when once attached, is not easily detached from the base due to the interlocking mechanism. Thus, the coil device has further enhanced vibration resistance and shock resistance.
It is an interesting alternative that either the support portion or the base is provided with a projection and the other is provided with a recess engageable with the projection.
Owing to the above further engagement mechanism composed of a projection and a recess, the core cover has enhanced accuracy of attachment position. This makes it possible to eliminate the attachment chattering (or loseness of joints) of the coil device.
REFERENCES:
patent: 020298005 (1990-10-01), None
patent: 406231963 (1994-08-01), None
patent: 0122608 (1998-11-01), None
Miyamoto Masami
Mochizuki Yoshihiro
Suzuki Tetsuya
Suzuki Yoshiyuki
FDK Corporation
Gellner Michael L.
Mai Anh
Wenderoth , Lind & Ponack, L.L.P.
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